Based on 1st edition roleplay, Dwarfs: Stone & Steel, the Empire first came to build cannon in 1991 IC
Nuln
Nuln's 850 Dwarfs live primarily in the Schwarzrauch district on the south bank of the River Aver, near its confluence with the Reik. Nearby is the renowned Imperial Gunnery School and the Richtofen Armaments Foundry, Both were founded by the Dwarf Engineers Guild for the Nuln Emperor in 1991 I.C. With the consent of the High King and the Guild master of Karaz-a-Karak, the Dwarf Engineers of Nuln instructed their neighbours in the craft of manufacturing cannon barrels and mixing gunpowder. The lmperial Gunnery School maintains close ties with the Dwarf Engineers' Guild.
And it is also stated that on page 109's timeline that it is when cannons found its way into the imperial arsenal.
WFRP 2nd edition contradicted this however, by stating in
Companion that "The first foundry and gunnery school was established in the century leading up to the Great War Against Chaos" (page 99), thus putting in in the 2200s.
This is further fucked in 4th edition RP:
From the Dwarfs the technology spread to Humans, though this was a slow process as the Dwarfs guarded their technological secrets jealously. By the year 2000 IC, gunpowder weapons began to appear throughout the Old World, mainly via the close relationship between the Dwarfs and the people of the Empire, and from there the secret of black powder escaped into the wider world. Though Dwarf powder remains the best and most reliable available, cruder — yet effective — mixtures are produced and used in far greater quantities by the forces of the Empire and beyond. Despite the limitations and dangers of this new technology, its utility is undeniable.
----------------------------------------Up in Arms (p. 99),
When handguns began to proliferate in the armies of the Empire circa 2000 IC, Borys von Tasseninck refused to supply them to Ostland’s State Troops, claiming ‘their implementation would mean wasting perfectly good swords and spears’. These words have become proverbial, uttered every time an Ostlander wishes to decry out-of touch aristocrats.
----------------------------------------Sea of Claws (p.29)
My opinion is that, multiple sources put gunpowder weapon's introduction to the imperial arsenal as early as the 2000 IC (Mordheim, RP1 & 4), so 2nd is clearly mistaken and it should have been "centuries" instead of "century".
Anyways, huntsmen are clearly militia, and imperial archers ain't no longbowmen, that's for sure. I don't like them as the mainline range unit precisely due to the "feel" they have. Like they are reasonable pickets and skirmishers, but handguns/crossbows should be the professional soldiers in the Imperial army.
Also because the Empire should be like the H.R.E. Landsknecht, so no archers